PRB: Problems Using CDO Against an Exchange 4.x Server

• Collaboration Data Objects (CDO), versions 1.1, 1.2, 1.21
• Microsoft Exchange Server, version 4.0

SYMPTOMS

When you run an application that makes use of Collaboration Data Objects (CDO) as a Service on Windows NT, various functions may yield an error although the same code functions without error outside of a Service.

CAUSE

When you run CDO from a Windows NT Service, the calls are in UNICODE. Exchange Server version 4.x does not support UNICODE.

RESOLUTION

Here are two resolutions:

• Write the application to use Extended Messaging Application Programming Interface (MAPI) with non-UNICODE functions instead of CDO.
  
  -or-



• Upgrade the Microsoft Exchange Server version 4.x to Microsoft Exchange Server version 5.0 or later.

MORE INFORMATION

Here are the results of running various versions of CDO from a Service against Microsoft Exchange Server 4.x:

    CDO 1.0: Cannot run from a Windows NT Service in any manner.

    CDO 1.1: Can run from a Windows NT Service, but is unable to Resolve a
             Recipient's Name into an AddressEntry.

    CDO 1.21: Calling the Logon method of the Session object results in a
              "MAPI_E_NO_SUPPORT" error. 

Additional query words:

Keywords : kbActMsg kbCDO kbCDO110 kbCDO120 kbCDO121 kbMsg
Version : WINDOWS:1.1,1.2,1.21; winnt:4.0
Platform : WINDOWS winnt
Issue type : kbprb